diff --git a/Dog-Age-Calculator/dogage.py b/Dog-Age-Calculator/dogage.py
new file mode 100644
index 0000000..19026bf
--- /dev/null
+++ b/Dog-Age-Calculator/dogage.py
@@ -0,0 +1,15 @@
+def calculate_dog_age(human_age):
+    if human_age < 0:
+        return None
+    if human_age <= 2:
+        return human_age * 10.5
+    return 21 + (human_age - 2) * 4
+
+
+human_age = int(input("Enter a dog's age in human years: "))
+dog_age = calculate_dog_age(human_age)
+
+if dog_age is None:
+    print("Age must be a positive number.")
+else:
+    print(f"The dog's age in dog years is {dog_age}.")
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